Elevator.



J. J. SCHWOB.

ELEVATOR.

APPLICATION FILED PEB. 23. 1904. N0 MODEL'.

P'ATENTED MAY 24,1904.

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Patented May 24, 1904.

PATENT OEEICE.

JOHN J. SOHWOB, OF ST. LOUIS, MISSORI.

ELEVATOFI.I

SPECIFICATION forming part of Letters Patent No. 761,011, dated May 24, 1904.

Application filed February 23, 1904. Serial No. 194,916. (No model.)

T all whom it may concern:

Be it known that I, JOHN J. ScHwoB, a citil zen of the United States, residing at St. Louis,

State of Missouri, have invented certain new and useful Improvements in Elevators, of 'which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to elevators; and it consists of the novel features herein shown, described, and claimed.

In the drawings, Figure 1 is ay detail showing the bulkhead and elevator-collar in section and the first floor in elevation, parts being broken away to economize space. Fig. 2 is a horizontal section on the line 2 2 of Fig. 1. Fig. 3 is a section on the line 3 3 of Fig. 1. Fig. 4 is a horizontal section on the line 4 4 of Fig. 1. y

Referring to the drawings'in detail, the lower end of the elevator-shaft terminates in an air-tight bulkhead 5, set in masonry 6, embedded in the ground. An air-pipe 7 leads from the lower end of the bulkhead 6 upwardly to a convenient position, and an intake-valve 8 and an adjustable blow-off valve 9 are fixed upon the upper end of the pipe 7.

The bottom 10 of the elevator-car may be constructed of wood, and a metal plate 11 is placed against the bottom 10, said plate being held in position by the metallic binding-sections 12 and 13, said sections beingin the form of a channel-bar in cross-section', each section forming half a square in plan.

The bulkhead 6 is slightly larger than the outer faces of the sections 12 and 13, thus leaving the air-space 14 between the bulkhead and the car, so as to allow the air to pass readily to a limited extent either to or from the space between the floor of the car and the bottom of the bulkhead. The lower ends of the runners 15 extend to Vthe bottom of the inner faces ofl the runners and the bottom of the car through which the air may escape from below the car as the car descends into the bulkhead, said spaces constantly decreasing in size as the car goes down. Notches are formed in the bottom of the car to receive the full size of the runners 15. Posts 17 extend upwardly from the bottom 10, and the guide-clips 18 are secured to these posts and embrace the runners to hold the car in its vertical position.

Supposing that the car is in the bottom of the bulkhead and is to be elevated, air will pass into the bulkhead through the intakevalve 8 and through the air-space 14 around the bottom of the car, and as the car passes to the upper part of the bulkhead additional air will pass through the cut-away portions 16 of the runners. The upper end 19 of the bulkhead is iiared outward. Should the cable break or the car fall for any reason, a compressed-air cushion will be formed within the bulkhead, and as the car descends into the bulkhead and the air-pressure is greatly increased ai r will pass outwardly from the blowoff valve 9 and upwardly through the cut-away portions 16 of the runners and through the space 14 around the bottom of the car. As the car continues to descend into the bulkhead the cut-away portions 16 become smaller and smaller, thus reducing the space through which the air can escape until the car nears the bottom of the bulkhead, and these spaces are reduced to a minimum. Then the air can escape only through the blow-off valve 9 and through the space 14 and the car will settle down easily into the bulkhead.

A trap-door 2O is provided in the roof of the car, through which the operator may climb out of the car after the car has passed into the bulkhead.

I claim- 1. In an elevator, the combination with an elevator-shaft of an air-tight bulkhead extending downwardly from. the shaft; runners extending to the bottom of the bulkhead, there being wedge-shaped'cut-away portions at the inner faces of said runners, thewidest part of said cut-away portions being near the top of the bulkhead; an outlet-pipe leading from IOO the bulkhead; an inlet-valve and blow-off valve connected to said outlet-pipe; and an elevator-car adapted to engage said runners and descend into the bulkhead, there being a metallic binding around the floor of the ear and leaving a slight air-space between the binding and the wall of the bulkhead, substantially as specified.

2. In an elevator; the air-tight bulkhead 5 at the lower end of the elevator-shaft; the elevator-car adapted to descend into the bulkhead and having the bottom the metallic plate 11 placed against the bottom; the metallic binding-sections 12 and 13 applied to the edges of the bottom so as to form a slight air-space between said binding-sections and the inner Jface of the bulkhead; an outlet-pipe leading from the bottom of the bulkhead; an intake-valve connected to the outlet-pipe; and a blow-off Valve connected to the outlet-pipe; substantially as speciiied.

3. In an elevator; an' air-tight bulkhead 5 set in masonry and embedded in the ground at the lower end of the elevator-shaft; the runners 15 extending to the bottom of the bulkhead and having the cut-away portions 16 at their inner faces and beginning near the upper end of the bulkhead, said cut-away portions decreasing downwardly, the bottom edge of the elevator-car having notches to receive the runners; and the metallic binding-sections 12 and 13 applied to the edges of the bottom 10 and leaving a slight air-space between the bottom and the inner face of the bulkhead,- substantially as speciied.

In testimony whereof I have signed my name to this specification in presence of two subseribing witnesses.

JOHN J. SCHWOB. Witnesses:

J. L. HOPKINS, ALFRED A. Eicks. 

